Useful lumen definition
New EU regulation requires directional light sources and luminous flux to be measured within a 90° or a 120° cone. Luminous flux measurements are normally done at full 360° in […]
Teaching light photometry
Henrik Clausen, one of Scandinavia’s most skilled lighting experts, explains how they use the LightSpion at the Fagerhult academy to test light sources and educate their employees about light. Fagerhult […]